His Imperial Highness Prince Hitachi
- Name
- Lineage
- Second Son of Emperor Showa
- Date of Birth
- The Personal Title for Young Members(Been conferred in accordance with the Imperial Family's tradition of appellation)
- Prince Yoshi(Yoshi-no-Miya)
- Coming of Age Ceremony
- 28 November 1955 (at the age of 20)
- Honorary Positions
- President of the Japanese Society for the Preservation of Birds
- President of the Japanese Society for Disabled Children
- President of the Japan Institute of Invention and Innovation
- President of the Japan-Denmark Society
- President of the Dainippon Silk Foundation
- President of the Japanese Society for Rehabilitation of Persons with Disabilities
- President of the Japan Art Association
- President of the Tokyo Zoological Park Society
- President of Maison Franco-Japonaise
- President of the Princess Takamatsu Cancer Research Fund
- Honorary President of the Japan-Sweden Society
- Honorary President of the Japan-Belgium Society
- Honorary President of the Japanese Foundation for Cancer Research
- Honorary President of Association Pasteur Japon
- Honorary Vice-President of the Japanese Red Cross Society
- Education
- 1958 - Graduated from Gakushuin University
- 1969 - Became Research Associate of the Japanese Foundation for Cancer Research
Her Imperial Highness Princess Hitachi
- Name
- Lineage
- Fourth Daughter of the late Yoshitaka Tsugaru
- Date of Birth
- Honorary Positions
- Member of the Imperial House Council
- Honorary President of the Japan Ikebana Art Association
- Honorary President of the Japan Animal Welfare Society
- Honorary President of the Japan Equestrian Federation
- Honorary President of the Nippon-Latin American Ladies' Association
- Honorary Vice-President of the Japanese Red Cross Society
- Education
- 1961 - Graduated from Gakushuin Women's Junior College
- Translation
- The Eighty-Ninth Kitten by Eleanor Nilsson (published in 1987)
- The Most Obedient Dog in the World by Anita Jeram (published in 1996)
- It was Jake by Anita Jeram (published in 1997)
- A Guide Dog Puppy Grows up by Caroline Arnold (published in 2001)
Marriage
- Imperial House Council
- Engagement Ceremony (Nosai no Gi)
- Marriage